61649626751 has 4 divisors (see below), whose sum is σ = 61650253992. Its totient is φ = 61648999512.

The previous prime is 61649626741. The next prime is 61649626763. The reversal of 61649626751 is 15762694616.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61649626751 - 2³⁰ = 60575884927 is a prime.

It is a super-2 number, since 2×61649626751² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61649626693 and 61649626702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61649626741) 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, 130580 + ... + 374633.

It is an arithmetic number, because the mean of its divisors is an integer number (15412563498).

Almost surely, 2^61649626751 is an apocalyptic number.

61649626751 is a deficient number, since it is larger than the sum of its proper divisors (627241).

61649626751 is a wasteful number, since it uses less digits than its factorization.

61649626751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627240.

The product of its digits is 3265920, while the sum is 53.

The spelling of 61649626751 in words is "sixty-one billion, six hundred forty-nine million, six hundred twenty-six thousand, seven hundred fifty-one".