161611101649998 has 96 divisors (see below), whose sum is σ = 470141386670592. Its totient is φ = 38747916475200.

The previous prime is 161611101649993. The next prime is 161611101650083. The reversal of 161611101649998 is 899946101116161.

161611101649998 is a `hidden beast` number, since 1 + 6 + 1 + 611 + 1 + 0 + 1 + 6 + 4 + 9 + 9 + 9 + 8 = 666.

It is a super-2 number, since 2×161611101649998² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161611101649993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4484694538 + ... + 4484730573.

It is an arithmetic number, because the mean of its divisors is an integer number (4897306111152).

Almost surely, 2^{161611101649998} is an apocalyptic number.

161611101649998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161611101649998 is an abundant number, since it is smaller than the sum of its proper divisors (308530285020594).

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

161611101649998 is a wasteful number, since it uses less digits than its factorization.

161611101649998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8969425150 (or 8969425147 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 63.

The spelling of 161611101649998 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred one million, six hundred forty-nine thousand, nine hundred ninety-eight".