72149391877 has 2 divisors, whose sum is σ = 72149391878. Its totient is φ = 72149391876.

The previous prime is 72149391869. The next prime is 72149391907. The reversal of 72149391877 is 77819394127.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72063254916 + 86136961 = 268446^2 + 9281^2 .

It is a cyclic number.

It is not a de Polignac number, because 72149391877 - 2³ = 72149391869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72149391077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36074695938 + 36074695939.

It is an arithmetic number, because the mean of its divisors is an integer number (36074695939).

Almost surely, 2^72149391877 is an apocalyptic number.

It is an amenable number.

72149391877 is a deficient number, since it is larger than the sum of its proper divisors (1).

72149391877 is an equidigital number, since it uses as much as digits as its factorization.

72149391877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 58.

The spelling of 72149391877 in words is "seventy-two billion, one hundred forty-nine million, three hundred ninety-one thousand, eight hundred seventy-seven".