7635451681 has 16 divisors (see below), whose sum is σ = 8980651008. Its totient is φ = 6399993600.

The previous prime is 7635451669. The next prime is 7635451687. The reversal of 7635451681 is 1861545367.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-7635451681 is a prime.

It is a super-2 number, since 2×7635451681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7635451687) 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 15 ways as a sum of consecutive naturals, for example, 95680 + ... + 156286.

It is an arithmetic number, because the mean of its divisors is an integer number (561290688).

Almost surely, 2^7635451681 is an apocalyptic number.

It is an amenable number.

7635451681 is a deficient number, since it is larger than the sum of its proper divisors (1345199327).

7635451681 is a wasteful number, since it uses less digits than its factorization.

7635451681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61512.

The product of its digits is 604800, while the sum is 46.

The square root of 7635451681 is about 87381.0716402586. The cubic root of 7635451681 is about 1969.1474817960.

The spelling of 7635451681 in words is "seven billion, six hundred thirty-five million, four hundred fifty-one thousand, six hundred eighty-one".