72497177461 has 4 divisors (see below), whose sum is σ = 76312818400. Its totient is φ = 68681536524.

The previous prime is 72497177449. The next prime is 72497177471. The reversal of 72497177461 is 16477179427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72497177461 - 2⁵ = 72497177429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72497177471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907820441 + ... + 1907820478.

It is an arithmetic number, because the mean of its divisors is an integer number (19078204600).

Almost surely, 2^72497177461 is an apocalyptic number.

It is an amenable number.

72497177461 is a deficient number, since it is larger than the sum of its proper divisors (3815640939).

72497177461 is a wasteful number, since it uses less digits than its factorization.

72497177461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815640938.

The product of its digits is 4148928, while the sum is 55.

The spelling of 72497177461 in words is "seventy-two billion, four hundred ninety-seven million, one hundred seventy-seven thousand, four hundred sixty-one".