61819770406 has 16 divisors (see below), whose sum is σ = 93135042000. Its totient is φ = 30774852000.

The previous prime is 61819770401. The next prime is 61819770407. The reversal of 61819770406 is 60407791816.

It is a self number, because there is not a number n which added to its sum of digits gives 61819770406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61819770401) 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, 1357600 + ... + 1402396.

It is an arithmetic number, because the mean of its divisors is an integer number (5820940125).

Almost surely, 2^61819770406 is an apocalyptic number.

61819770406 is a deficient number, since it is larger than the sum of its proper divisors (31315271594).

61819770406 is a wasteful number, since it uses less digits than its factorization.

61819770406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47799.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 61819770406 in words is "sixty-one billion, eight hundred nineteen million, seven hundred seventy thousand, four hundred six".