53957720981 has 2 divisors, whose sum is σ = 53957720982. Its totient is φ = 53957720980.

The previous prime is 53957720959. The next prime is 53957721011. The reversal of 53957720981 is 18902775935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53472400081 + 485320900 = 231241^2 + 22030^2 .

It is a cyclic number.

It is not a de Polignac number, because 53957720981 - 2¹⁴ = 53957704597 is a prime.

It is a super-2 number, since 2×53957720981² (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 (53957720581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26978860490 + 26978860491.

It is an arithmetic number, because the mean of its divisors is an integer number (26978860491).

Almost surely, 2^53957720981 is an apocalyptic number.

It is an amenable number.

53957720981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53957720981 is an equidigital number, since it uses as much as digits as its factorization.

53957720981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 53957720981 in words is "fifty-three billion, nine hundred fifty-seven million, seven hundred twenty thousand, nine hundred eighty-one".