2156690518 has 4 divisors (see below), whose sum is σ = 3235035780. Its totient is φ = 1078345258.

The previous prime is 2156690489. The next prime is 2156690539. The reversal of 2156690518 is 8150966512.

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

It is a super-2 number, since 2×2156690518² = 9302627980862216648, 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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539172628 + ... + 539172631.

It is an arithmetic number, because the mean of its divisors is an integer number (808758945).

Almost surely, 2^2156690518 is an apocalyptic number.

2156690518 is a deficient number, since it is larger than the sum of its proper divisors (1078345262).

2156690518 is a wasteful number, since it uses less digits than its factorization.

2156690518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078345261.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 2156690518 is about 46440.1821486523. The cubic root of 2156690518 is about 1292.0002855549. Note that the first 3 decimals are identical.

The spelling of 2156690518 in words is "two billion, one hundred fifty-six million, six hundred ninety thousand, five hundred eighteen".