6615511611651 has 24 divisors (see below), whose sum is σ = 9995003665920. Its totient is φ = 4208518832496.

The previous prime is 6615511611617. The next prime is 6615511611713. The reversal of 6615511611651 is 1561161155166.

6615511611651 is a `hidden beast` number, since 6 + 6 + 15 + 5 + 11 + 611 + 6 + 5 + 1 = 666.

It is not a de Polignac number, because 6615511611651 - 2⁶ = 6615511611587 is a prime.

It is a super-2 number, since 2×6615511611651² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6615511611597 and 6615511611606.

It is not an unprimeable number, because it can be changed into a prime (6615511611151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38050491 + ... + 38223956.

It is an arithmetic number, because the mean of its divisors is an integer number (416458486080).

Almost surely, 2^{6615511611651} is an apocalyptic number.

6615511611651 is a deficient number, since it is larger than the sum of its proper divisors (3379492054269).

6615511611651 is a wasteful number, since it uses less digits than its factorization.

6615511611651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76274895 (or 76274892 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The spelling of 6615511611651 in words is "six trillion, six hundred fifteen billion, five hundred eleven million, six hundred eleven thousand, six hundred fifty-one".