61003653645 has 64 divisors (see below), whose sum is σ = 110086299648. Its totient is φ = 28578528000.

The previous prime is 61003653637. The next prime is 61003653661. The reversal of 61003653645 is 54635630016.

It is a happy number.

It is not a de Polignac number, because 61003653645 - 2³ = 61003653637 is a prime.

It is a super-3 number, since 3×61003653645³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3371994 + ... + 3390036.

It is an arithmetic number, because the mean of its divisors is an integer number (1720098432).

Almost surely, 2^61003653645 is an apocalyptic number.

It is an amenable number.

61003653645 is a deficient number, since it is larger than the sum of its proper divisors (49082646003).

61003653645 is a wasteful number, since it uses less digits than its factorization.

61003653645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18754.

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 61003653645 in words is "sixty-one billion, three million, six hundred fifty-three thousand, six hundred forty-five".