3611666515551 has 32 divisors (see below), whose sum is σ = 5322129753600. Its totient is φ = 2166956335104.

The previous prime is 3611666515537. The next prime is 3611666515579. The reversal of 3611666515551 is 1555156661163.

It is not a de Polignac number, because 3611666515551 - 2⁷ = 3611666515423 is a prime.

It is a super-3 number, since 3×3611666515551³ (a number of 39 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 3611666515494 and 3611666515503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3611666515151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3403071 + ... + 4336383.

It is an arithmetic number, because the mean of its divisors is an integer number (166316554800).

Almost surely, 2^{3611666515551} is an apocalyptic number.

3611666515551 is a deficient number, since it is larger than the sum of its proper divisors (1710463238049).

3611666515551 is a wasteful number, since it uses less digits than its factorization.

3611666515551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936655.

The product of its digits is 2430000, while the sum is 51.

The spelling of 3611666515551 in words is "three trillion, six hundred eleven billion, six hundred sixty-six million, five hundred fifteen thousand, five hundred fifty-one".