161477902 has 4 divisors (see below), whose sum is σ = 242216856. Its totient is φ = 80738950.

The previous prime is 161477881. The next prime is 161477929. The reversal of 161477902 is 209774161.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161477902² = 52150225668643208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40369474 + ... + 40369477.

It is an arithmetic number, because the mean of its divisors is an integer number (60554214).

Almost surely, 2^161477902 is an apocalyptic number.

161477902 is a deficient number, since it is larger than the sum of its proper divisors (80738954).

161477902 is an equidigital number, since it uses as much as digits as its factorization.

161477902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80738953.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 161477902 is about 12707.3955632144. The cubic root of 161477902 is about 544.5499210364.

The spelling of 161477902 in words is "one hundred sixty-one million, four hundred seventy-seven thousand, nine hundred two".