161211477857 has 8 divisors (see below), whose sum is σ = 163439834784. Its totient is φ = 158983661088.

The previous prime is 161211477829. The next prime is 161211477859. The reversal of 161211477857 is 758774112161.

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

It is a cyclic number.

It is not a de Polignac number, because 161211477857 - 2³² = 156916510561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161211477859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485558 + ... + 747120.

It is an arithmetic number, because the mean of its divisors is an integer number (20429979348).

Almost surely, 2^161211477857 is an apocalyptic number.

It is an amenable number.

161211477857 is a deficient number, since it is larger than the sum of its proper divisors (2228356927).

161211477857 is an equidigital number, since it uses as much as digits as its factorization.

161211477857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270079.

The product of its digits is 658560, while the sum is 50.

The spelling of 161211477857 in words is "one hundred sixty-one billion, two hundred eleven million, four hundred seventy-seven thousand, eight hundred fifty-seven".