28156714655801 has 2 divisors, whose sum is σ = 28156714655802. Its totient is φ = 28156714655800.

The previous prime is 28156714655791. The next prime is 28156714655837. The reversal of 28156714655801 is 10855641765182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21901688645776 + 6255026010025 = 4679924^2 + 2501005^2 .

It is a cyclic number.

It is not a de Polignac number, because 28156714655801 - 2³⁰ = 28155640913977 is a prime.

It is not a weakly prime, because it can be changed into another prime (28156711655801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14078357327900 + 14078357327901.

It is an arithmetic number, because the mean of its divisors is an integer number (14078357327901).

Almost surely, 2^{28156714655801} is an apocalyptic number.

It is an amenable number.

28156714655801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28156714655801 is an equidigital number, since it uses as much as digits as its factorization.

28156714655801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128000, while the sum is 59.

The spelling of 28156714655801 in words is "twenty-eight trillion, one hundred fifty-six billion, seven hundred fourteen million, six hundred fifty-five thousand, eight hundred one".