81372207362 has 4 divisors (see below), whose sum is σ = 122058311046. Its totient is φ = 40686103680.

The previous prime is 81372207341. The next prime is 81372207493. The reversal of 81372207362 is 26370227318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26370227318 = 2 ⋅13185113659.

It can be written as a sum of positive squares in only one way, i.e., 72065939401 + 9306267961 = 268451^2 + 96469^2 .

It is a super-2 number, since 2×81372207362² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20343051839 + ... + 20343051842.

Almost surely, 2^81372207362 is an apocalyptic number.

81372207362 is a deficient number, since it is larger than the sum of its proper divisors (40686103684).

81372207362 is a wasteful number, since it uses less digits than its factorization.

81372207362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40686103683.

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 81372207362 in words is "eighty-one billion, three hundred seventy-two million, two hundred seven thousand, three hundred sixty-two".