61491521626 has 8 divisors (see below), whose sum is σ = 93099313440. Its totient is φ = 30458417148.

The previous prime is 61491521563. The next prime is 61491521633. The reversal of 61491521626 is 62612519416.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143671566 + ... + 143671993.

It is an arithmetic number, because the mean of its divisors is an integer number (11637414180).

Almost surely, 2^61491521626 is an apocalyptic number.

61491521626 is a deficient number, since it is larger than the sum of its proper divisors (31607791814).

61491521626 is a wasteful number, since it uses less digits than its factorization.

61491521626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287343668.

The product of its digits is 155520, while the sum is 43.

The spelling of 61491521626 in words is "sixty-one billion, four hundred ninety-one million, five hundred twenty-one thousand, six hundred twenty-six".