63401855501 has 2 divisors, whose sum is σ = 63401855502. Its totient is φ = 63401855500.

The previous prime is 63401855483. The next prime is 63401855509. The reversal of 63401855501 is 10555810436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57633604900 + 5768250601 = 240070^2 + 75949^2 .

It is a cyclic number.

It is not a de Polignac number, because 63401855501 - 2⁶ = 63401855437 is a prime.

It is a super-2 number, since 2×63401855501² (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 (63401855509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31700927750 + 31700927751.

It is an arithmetic number, because the mean of its divisors is an integer number (31700927751).

Almost surely, 2^63401855501 is an apocalyptic number.

It is an amenable number.

63401855501 is a deficient number, since it is larger than the sum of its proper divisors (1).

63401855501 is an equidigital number, since it uses as much as digits as its factorization.

63401855501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 63401855501 in words is "sixty-three billion, four hundred one million, eight hundred fifty-five thousand, five hundred one".