61719475751 has 4 divisors (see below), whose sum is σ = 61727188104. Its totient is φ = 61711763400.

The previous prime is 61719475739. The next prime is 61719475771. The reversal of 61719475751 is 15757491716.

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 61719475751 - 2²⁶ = 61652366887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61719475693 and 61719475702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61719475711) 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, 3844160 + ... + 3860181.

It is an arithmetic number, because the mean of its divisors is an integer number (15431797026).

Almost surely, 2^61719475751 is an apocalyptic number.

61719475751 is a deficient number, since it is larger than the sum of its proper divisors (7712353).

61719475751 is an equidigital number, since it uses as much as digits as its factorization.

61719475751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7712352.

The product of its digits is 1852200, while the sum is 53.

The spelling of 61719475751 in words is "sixty-one billion, seven hundred nineteen million, four hundred seventy-five thousand, seven hundred fifty-one".