61261531457 has 8 divisors (see below), whose sum is σ = 70014993216. Its totient is φ = 52508523312.

The previous prime is 61261531447. The next prime is 61261531459. The reversal of 61261531457 is 75413516216.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61261531457 - 2¹⁸ = 61261269313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61261531459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256403 + ... + 433895.

It is an arithmetic number, because the mean of its divisors is an integer number (8751874152).

Almost surely, 2^61261531457 is an apocalyptic number.

It is an amenable number.

61261531457 is a deficient number, since it is larger than the sum of its proper divisors (8753461759).

61261531457 is a wasteful number, since it uses less digits than its factorization.

61261531457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226807.

The product of its digits is 151200, while the sum is 41.

The spelling of 61261531457 in words is "sixty-one billion, two hundred sixty-one million, five hundred thirty-one thousand, four hundred fifty-seven".