72757473107781 has 16 divisors (see below), whose sum is σ = 120947487763968. Its totient is φ = 37796089926000.

The previous prime is 72757473107779. The next prime is 72757473107791. The reversal of 72757473107781 is 18770137475727.

It is not a de Polignac number, because 72757473107781 - 2¹ = 72757473107779 is a prime.

It is a super-2 number, since 2×72757473107781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72757473107791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157483707795 + ... + 157483708256.

It is an arithmetic number, because the mean of its divisors is an integer number (7559217985248).

Almost surely, 2^{72757473107781} is an apocalyptic number.

It is an amenable number.

72757473107781 is a deficient number, since it is larger than the sum of its proper divisors (48190014656187).

72757473107781 is a wasteful number, since it uses less digits than its factorization.

72757473107781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314967416072.

The product of its (nonzero) digits is 112943040, while the sum is 66.

The spelling of 72757473107781 in words is "seventy-two trillion, seven hundred fifty-seven billion, four hundred seventy-three million, one hundred seven thousand, seven hundred eighty-one".