61978569097 has 8 divisors (see below), whose sum is σ = 63724534272. Its totient is φ = 60243760800.

The previous prime is 61978569091. The next prime is 61978569151. The reversal of 61978569097 is 79096587916.

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

It is a cyclic number.

It is not a de Polignac number, because 61978569097 - 2³ = 61978569089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61978569091) 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, 2777953 + ... + 2800174.

It is an arithmetic number, because the mean of its divisors is an integer number (7965566784).

Almost surely, 2^61978569097 is an apocalyptic number.

It is an amenable number.

61978569097 is a deficient number, since it is larger than the sum of its proper divisors (1745965175).

61978569097 is a wasteful number, since it uses less digits than its factorization.

61978569097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5578439.

The product of its (nonzero) digits is 51438240, while the sum is 67.

The spelling of 61978569097 in words is "sixty-one billion, nine hundred seventy-eight million, five hundred sixty-nine thousand, ninety-seven".