61705620671 has 4 divisors (see below), whose sum is σ = 62626600152. Its totient is φ = 60784641192.

The previous prime is 61705620661. The next prime is 61705620677. The reversal of 61705620671 is 17602650716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61705620671 - 2¹⁴ = 61705604287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61705620677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460489640 + ... + 460489773.

It is an arithmetic number, because the mean of its divisors is an integer number (15656650038).

Almost surely, 2^61705620671 is an apocalyptic number.

61705620671 is a deficient number, since it is larger than the sum of its proper divisors (920979481).

61705620671 is an equidigital number, since it uses as much as digits as its factorization.

61705620671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920979480.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 61705620671 in words is "sixty-one billion, seven hundred five million, six hundred twenty thousand, six hundred seventy-one".