1611166551651 has 12 divisors (see below), whose sum is σ = 2428424947728. Its totient is φ = 1027410554544.

The previous prime is 1611166551623. The next prime is 1611166551661. The reversal of 1611166551651 is 1561556611161.

1611166551651 is a `hidden beast` number, since 1 + 6 + 11 + 16 + 65 + 516 + 51 = 666.

It is not a de Polignac number, because 1611166551651 - 2⁵ = 1611166551619 is a prime.

It is a super-3 number, since 3×1611166551651³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1611166551597 and 1611166551606.

It is not an unprimeable number, because it can be changed into a prime (1611166551661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3891706440 + ... + 3891706853.

It is an arithmetic number, because the mean of its divisors is an integer number (202368745644).

Almost surely, 2^{1611166551651} is an apocalyptic number.

1611166551651 is a deficient number, since it is larger than the sum of its proper divisors (817258396077).

1611166551651 is a wasteful number, since it uses less digits than its factorization.

1611166551651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7783413322 (or 7783413319 counting only the distinct ones).

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

The spelling of 1611166551651 in words is "one trillion, six hundred eleven billion, one hundred sixty-six million, five hundred fifty-one thousand, six hundred fifty-one".