161994044757 has 16 divisors (see below), whose sum is σ = 225645815808. Its totient is φ = 103253097840.

The previous prime is 161994044753. The next prime is 161994044761. The reversal of 161994044757 is 757440499161.

It is an interprime number because it is at equal distance from previous prime (161994044753) and next prime (161994044761).

It is not a de Polignac number, because 161994044757 - 2² = 161994044753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161994044697 and 161994044706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161994044753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10485483 + ... + 10500920.

It is an arithmetic number, because the mean of its divisors is an integer number (14102863488).

Almost surely, 2^161994044757 is an apocalyptic number.

It is an amenable number.

161994044757 is a deficient number, since it is larger than the sum of its proper divisors (63651771051).

161994044757 is a wasteful number, since it uses less digits than its factorization.

161994044757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20986520.

The product of its (nonzero) digits is 7620480, while the sum is 57.

The spelling of 161994044757 in words is "one hundred sixty-one billion, nine hundred ninety-four million, forty-four thousand, seven hundred fifty-seven".