72191407506 has 16 divisors (see below), whose sum is σ = 147740555424. Its totient is φ = 23504179104.

The previous prime is 72191407501. The next prime is 72191407523. The reversal of 72191407506 is 60570419127.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (72191407501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139905571 + ... + 139906086.

It is an arithmetic number, because the mean of its divisors is an integer number (9233784714).

Almost surely, 2^72191407506 is an apocalyptic number.

72191407506 is an abundant number, since it is smaller than the sum of its proper divisors (75549147918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72191407506 is a wasteful number, since it uses less digits than its factorization.

72191407506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279811705.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 72191407506 in words is "seventy-two billion, one hundred ninety-one million, four hundred seven thousand, five hundred six".