161538770 has 16 divisors (see below), whose sum is σ = 297862488. Its totient is φ = 63039360.

The previous prime is 161538761. The next prime is 161538791. The reversal of 161538770 is 77835161.

It can be written as a sum of positive squares in 4 ways, for example, as 33373729 + 128165041 = 5777^2 + 11321^2 .

It is a super-2 number, since 2×161538770² = 52189548426225800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196589 + ... + 197408.

Almost surely, 2^161538770 is an apocalyptic number.

161538770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161538770 is a deficient number, since it is larger than the sum of its proper divisors (136323718).

161538770 is a wasteful number, since it uses less digits than its factorization.

161538770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394045.

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

The square root of 161538770 is about 12709.7903208511. The cubic root of 161538770 is about 544.6183339077.

The spelling of 161538770 in words is "one hundred sixty-one million, five hundred thirty-eight thousand, seven hundred seventy".