55653850781 has 2 divisors, whose sum is σ = 55653850782. Its totient is φ = 55653850780.

The previous prime is 55653850751. The next prime is 55653850807. The reversal of 55653850781 is 18705835655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49679952100 + 5973898681 = 222890^2 + 77291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55653850781 is a prime.

It is a super-2 number, since 2×55653850781² (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 (55653850751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27826925390 + 27826925391.

It is an arithmetic number, because the mean of its divisors is an integer number (27826925391).

Almost surely, 2^55653850781 is an apocalyptic number.

It is an amenable number.

55653850781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55653850781 is an equidigital number, since it uses as much as digits as its factorization.

55653850781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040000, while the sum is 53.

The spelling of 55653850781 in words is "fifty-five billion, six hundred fifty-three million, eight hundred fifty thousand, seven hundred eighty-one".