161661015051610 has 32 divisors (see below), whose sum is σ = 291144936090240. Its totient is φ = 64629945736512.

The previous prime is 161661015051541. The next prime is 161661015051667. The reversal of 161661015051610 is 16150510166161.

It is a super-2 number, since 2×161661015051610² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155002956 + ... + 156042424.

It is an arithmetic number, because the mean of its divisors is an integer number (9098279252820).

Almost surely, 2^{161661015051610} is an apocalyptic number.

161661015051610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161661015051610 is a deficient number, since it is larger than the sum of its proper divisors (129483921038630).

161661015051610 is a wasteful number, since it uses less digits than its factorization.

161661015051610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047750.

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 161661015051610 in words is "one hundred sixty-one trillion, six hundred sixty-one billion, fifteen million, fifty-one thousand, six hundred ten".