161615400770 has 8 divisors (see below), whose sum is σ = 290907721404. Its totient is φ = 64646160304.

The previous prime is 161615400767. The next prime is 161615400773. The reversal of 161615400770 is 77004516161.

It is an interprime number because it is at equal distance from previous prime (161615400767) and next prime (161615400773).

It can be written as a sum of positive squares in 2 ways, for example, as 160529236921 + 1086163849 = 400661^2 + 32957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161615400770² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161615400773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8080770029 + ... + 8080770048.

Almost surely, 2^161615400770 is an apocalyptic number.

161615400770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161615400770 is a deficient number, since it is larger than the sum of its proper divisors (129292320634).

161615400770 is a wasteful number, since it uses less digits than its factorization.

161615400770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16161540084.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 161615400770 in words is "one hundred sixty-one billion, six hundred fifteen million, four hundred thousand, seven hundred seventy".