61375165381 has 2 divisors, whose sum is σ = 61375165382. Its totient is φ = 61375165380.

The previous prime is 61375165367. The next prime is 61375165387. The reversal of 61375165381 is 18356157316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58580457156 + 2794708225 = 242034^2 + 52865^2 .

It is a cyclic number.

It is not a de Polignac number, because 61375165381 - 2⁷ = 61375165253 is a prime.

It is a super-2 number, since 2×61375165381² (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 (61375165387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30687582690 + 30687582691.

It is an arithmetic number, because the mean of its divisors is an integer number (30687582691).

Almost surely, 2^61375165381 is an apocalyptic number.

It is an amenable number.

61375165381 is a deficient number, since it is larger than the sum of its proper divisors (1).

61375165381 is an equidigital number, since it uses as much as digits as its factorization.

61375165381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 46.

The spelling of 61375165381 in words is "sixty-one billion, three hundred seventy-five million, one hundred sixty-five thousand, three hundred eighty-one".