61204780816 has 45 divisors (see below), whose sum is σ = 119771285319. Its totient is φ = 30299082912.

The previous prime is 61204780801. The next prime is 61204780831. The reversal of 61204780816 is 61808740216.

The square root of 61204780816 is 247396.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (61204780801) and next prime (61204780831).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 125676925 + ... + 125677411.

Almost surely, 2^61204780816 is an apocalyptic number.

61204780816 is the 247396-th square number.

It is an amenable number.

61204780816 is a deficient number, since it is larger than the sum of its proper divisors (58566504503).

61204780816 is an frugal number, since it uses more digits than its factorization.

61204780816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 61204780816 in words is "sixty-one billion, two hundred four million, seven hundred eighty thousand, eight hundred sixteen".