61650537553 has 16 divisors (see below), whose sum is σ = 71689276800. Its totient is φ = 52395078400.

The previous prime is 61650537511. The next prime is 61650537583. The reversal of 61650537553 is 35573505616.

It is a cyclic number.

It is not a de Polignac number, because 61650537553 - 2⁹ = 61650537041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61650537583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1078453 + ... + 1134178.

It is an arithmetic number, because the mean of its divisors is an integer number (4480579800).

Almost surely, 2^61650537553 is an apocalyptic number.

It is an amenable number.

61650537553 is a deficient number, since it is larger than the sum of its proper divisors (10038739247).

61650537553 is a wasteful number, since it uses less digits than its factorization.

61650537553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212808.

The product of its (nonzero) digits is 1417500, while the sum is 46.

The spelling of 61650537553 in words is "sixty-one billion, six hundred fifty million, five hundred thirty-seven thousand, five hundred fifty-three".