55766405399 has 2 divisors, whose sum is σ = 55766405400. Its totient is φ = 55766405398.

The previous prime is 55766405363. The next prime is 55766405503. The reversal of 55766405399 is 99350466755.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55766405399 is a prime.

It is a super-2 number, since 2×55766405399² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55766405309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27883202699 + 27883202700.

It is an arithmetic number, because the mean of its divisors is an integer number (27883202700).

Almost surely, 2^55766405399 is an apocalyptic number.

55766405399 is a deficient number, since it is larger than the sum of its proper divisors (1).

55766405399 is an equidigital number, since it uses as much as digits as its factorization.

55766405399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618000, while the sum is 59.

The spelling of 55766405399 in words is "fifty-five billion, seven hundred sixty-six million, four hundred five thousand, three hundred ninety-nine".