15355855381 has 2 divisors, whose sum is σ = 15355855382. Its totient is φ = 15355855380.

The previous prime is 15355855331. The next prime is 15355855397. The reversal of 15355855381 is 18355855351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14796532881 + 559322500 = 121641^2 + 23650^2 .

It is a cyclic number.

It is not a de Polignac number, because 15355855381 - 2⁷ = 15355855253 is a prime.

It is a super-2 number, since 2×15355855381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15355855331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7677927690 + 7677927691.

It is an arithmetic number, because the mean of its divisors is an integer number (7677927691).

Almost surely, 2^15355855381 is an apocalyptic number.

It is an amenable number.

15355855381 is a deficient number, since it is larger than the sum of its proper divisors (1).

15355855381 is an equidigital number, since it uses as much as digits as its factorization.

15355855381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800000, while the sum is 49.

The spelling of 15355855381 in words is "fifteen billion, three hundred fifty-five million, eight hundred fifty-five thousand, three hundred eighty-one".