61780280615 has 8 divisors (see below), whose sum is σ = 74137790160. Its totient is φ = 49423255552.

The previous prime is 61780280603. The next prime is 61780280671. The reversal of 61780280615 is 51608208716.

It is a happy number.

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 61780280615 - 2⁴ = 61780280599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280487 + ... + 449703.

It is an arithmetic number, because the mean of its divisors is an integer number (9267223770).

Almost surely, 2^61780280615 is an apocalyptic number.

61780280615 is a deficient number, since it is larger than the sum of its proper divisors (12357509545).

61780280615 is a wasteful number, since it uses less digits than its factorization.

61780280615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242241.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 61780280615 in words is "sixty-one billion, seven hundred eighty million, two hundred eighty thousand, six hundred fifteen".