61680378490 has 32 divisors (see below), whose sum is σ = 117585126720. Its totient is φ = 23230209024.

The previous prime is 61680378481. The next prime is 61680378491. The reversal of 61680378490 is 9487308616.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61680378491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 964839 + ... + 1026778.

It is an arithmetic number, because the mean of its divisors is an integer number (3674535210).

Almost surely, 2^61680378490 is an apocalyptic number.

61680378490 is a deficient number, since it is larger than the sum of its proper divisors (55904748230).

61680378490 is a wasteful number, since it uses less digits than its factorization.

61680378490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991806.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 61680378490 in words is "sixty-one billion, six hundred eighty million, three hundred seventy-eight thousand, four hundred ninety".