61726783751 has 4 divisors (see below), whose sum is σ = 63232315104. Its totient is φ = 60221252400.

The previous prime is 61726783733. The next prime is 61726783799. The reversal of 61726783751 is 15738762716.

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 61726783751 - 2²⁶ = 61659674887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61726783693 and 61726783702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61726783711) 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, 752765615 + ... + 752765696.

It is an arithmetic number, because the mean of its divisors is an integer number (15808078776).

Almost surely, 2^61726783751 is an apocalyptic number.

61726783751 is a deficient number, since it is larger than the sum of its proper divisors (1505531353).

61726783751 is a wasteful number, since it uses less digits than its factorization.

61726783751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505531352.

The product of its digits is 2963520, while the sum is 53.

The spelling of 61726783751 in words is "sixty-one billion, seven hundred twenty-six million, seven hundred eighty-three thousand, seven hundred fifty-one".