153640898681 has 2 divisors, whose sum is σ = 153640898682. Its totient is φ = 153640898680.

The previous prime is 153640898659. The next prime is 153640898689. The reversal of 153640898681 is 186898046351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152790301456 + 850597225 = 390884^2 + 29165^2 .

It is a cyclic number.

It is not a de Polignac number, because 153640898681 - 2⁶ = 153640898617 is a prime.

It is a super-2 number, since 2×153640898681² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 153640898681.

It is not a weakly prime, because it can be changed into another prime (153640898689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76820449340 + 76820449341.

It is an arithmetic number, because the mean of its divisors is an integer number (76820449341).

Almost surely, 2^153640898681 is an apocalyptic number.

It is an amenable number.

153640898681 is a deficient number, since it is larger than the sum of its proper divisors (1).

153640898681 is an equidigital number, since it uses as much as digits as its factorization.

153640898681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9953280, while the sum is 59.

The spelling of 153640898681 in words is "one hundred fifty-three billion, six hundred forty million, eight hundred ninety-eight thousand, six hundred eighty-one".