161690262685 has 32 divisors (see below), whose sum is σ = 227006115840. Its totient is φ = 108254870592.

The previous prime is 161690262667. The next prime is 161690262689. The reversal of 161690262685 is 586262096161.

It is a cyclic number.

It is not a de Polignac number, because 161690262685 - 2⁷ = 161690262557 is a prime.

It is a super-2 number, since 2×161690262685² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161690262689) 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, 571962 + ... + 806548.

It is an arithmetic number, because the mean of its divisors is an integer number (7093941120).

Almost surely, 2^161690262685 is an apocalyptic number.

It is an amenable number.

161690262685 is a deficient number, since it is larger than the sum of its proper divisors (65315853155).

161690262685 is a wasteful number, since it uses less digits than its factorization.

161690262685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235065.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 161690262685 in words is "one hundred sixty-one billion, six hundred ninety million, two hundred sixty-two thousand, six hundred eighty-five".