64551615546 has 48 divisors (see below), whose sum is σ = 145742238432. Its totient is φ = 19032409440.

The previous prime is 64551615521. The next prime is 64551615571.

64551615546 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (64551615521) and next prime (64551615571).

It is a super-2 number, since 2×64551615546² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64551615495 and 64551615504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1174680 + ... + 1228403.

It is an arithmetic number, because the mean of its divisors is an integer number (3036296634).

Almost surely, 2^64551615546 is an apocalyptic number.

64551615546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64551615546 is an abundant number, since it is smaller than the sum of its proper divisors (81190622886).

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

64551615546 is a wasteful number, since it uses less digits than its factorization.

64551615546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403147 (or 2403136 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 48.

The spelling of 64551615546 in words is "sixty-four billion, five hundred fifty-one million, six hundred fifteen thousand, five hundred forty-six".