39920537951281 has 16 divisors (see below), whose sum is σ = 44378470624768. Its totient is φ = 35660781878400.

The previous prime is 39920537951269. The next prime is 39920537951381. The reversal of 39920537951281 is 18215973502993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39920537951281 is a prime.

It is a super-2 number, since 2×39920537951281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39920537951201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85158325 + ... + 85625821.

It is an arithmetic number, because the mean of its divisors is an integer number (2773654414048).

Almost surely, 2^{39920537951281} is an apocalyptic number.

39920537951281 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

39920537951281 is a deficient number, since it is larger than the sum of its proper divisors (4457932673487).

39920537951281 is a wasteful number, since it uses less digits than its factorization.

39920537951281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679432.

The product of its (nonzero) digits is 36741600, while the sum is 64.

The spelling of 39920537951281 in words is "thirty-nine trillion, nine hundred twenty billion, five hundred thirty-seven million, nine hundred fifty-one thousand, two hundred eighty-one".