91986374542 has 4 divisors (see below), whose sum is σ = 137979561816. Its totient is φ = 45993187270.

The previous prime is 91986374539. The next prime is 91986374563. The reversal of 91986374542 is 24547368919.

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

It is a super-2 number, since 2×91986374542² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22996593634 + ... + 22996593637.

It is an arithmetic number, because the mean of its divisors is an integer number (34494890454).

Almost surely, 2^91986374542 is an apocalyptic number.

91986374542 is a deficient number, since it is larger than the sum of its proper divisors (45993187274).

91986374542 is a wasteful number, since it uses less digits than its factorization.

91986374542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45993187273.

The product of its digits is 13063680, while the sum is 58.

The spelling of 91986374542 in words is "ninety-one billion, nine hundred eighty-six million, three hundred seventy-four thousand, five hundred forty-two".