63454526640 has 120 divisors (see below), whose sum is σ = 215211613968. Its totient is φ = 16753651200.

The previous prime is 63454526633. The next prime is 63454526647. The reversal of 63454526640 is 4662545436.

It is a happy number.

63454526640 is a `hidden beast` number, since 6 + 3 + 4 + 545 + 2 + 66 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (63454526633) and next prime (63454526647).

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×63454526640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (63454526647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363574 + ... + 509013.

Almost surely, 2^63454526640 is an apocalyptic number.

63454526640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63454526640 is an abundant number, since it is smaller than the sum of its proper divisors (151757087328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63454526640 is a wasteful number, since it uses less digits than its factorization.

63454526640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872707 (or 872698 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 45.

The spelling of 63454526640 in words is "sixty-three billion, four hundred fifty-four million, five hundred twenty-six thousand, six hundred forty".