61426819947 has 6 divisors (see below), whose sum is σ = 81902998972. Its totient is φ = 40950927112.

The previous prime is 61426819943. The next prime is 61426819981. The reversal of 61426819947 is 74991862416.

It is not a de Polignac number, because 61426819947 - 2² = 61426819943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61426819943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 357733 + ... + 500825.

Almost surely, 2^61426819947 is an apocalyptic number.

61426819947 is a deficient number, since it is larger than the sum of its proper divisors (20476179025).

61426819947 is an frugal number, since it uses more digits than its factorization.

61426819947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286189 (or 143096 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The spelling of 61426819947 in words is "sixty-one billion, four hundred twenty-six million, eight hundred nineteen thousand, nine hundred forty-seven".