61725551633 has 4 divisors (see below), whose sum is σ = 61864887408. Its totient is φ = 61586215860.

The previous prime is 61725551567. The next prime is 61725551639. The reversal of 61725551633 is 33615552716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61725551633 - 2³⁴ = 44545682449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61725551639) 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, 69667223 + ... + 69668108.

It is an arithmetic number, because the mean of its divisors is an integer number (15466221852).

Almost surely, 2^61725551633 is an apocalyptic number.

It is an amenable number.

61725551633 is a deficient number, since it is larger than the sum of its proper divisors (139335775).

61725551633 is a wasteful number, since it uses less digits than its factorization.

61725551633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139335774.

The product of its digits is 567000, while the sum is 44.

The spelling of 61725551633 in words is "sixty-one billion, seven hundred twenty-five million, five hundred fifty-one thousand, six hundred thirty-three".