37138821218 has 4 divisors (see below), whose sum is σ = 55708231830. Its totient is φ = 18569410608.

The previous prime is 37138821199. The next prime is 37138821301. The reversal of 37138821218 is 81212883173.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81212883173 = 147391 ⋅551003.

It can be written as a sum of positive squares in only one way, i.e., 33232196209 + 3906625009 = 182297^2 + 62503^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9284705303 + ... + 9284705306.

Almost surely, 2^37138821218 is an apocalyptic number.

37138821218 is a deficient number, since it is larger than the sum of its proper divisors (18569410612).

37138821218 is a wasteful number, since it uses less digits than its factorization.

37138821218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18569410611.

The product of its digits is 129024, while the sum is 44.

The spelling of 37138821218 in words is "thirty-seven billion, one hundred thirty-eight million, eight hundred twenty-one thousand, two hundred eighteen".