61121602557 has 24 divisors (see below), whose sum is σ = 88684115520. Its totient is φ = 40564756800.

The previous prime is 61121602519. The next prime is 61121602559. The reversal of 61121602557 is 75520612116.

61121602557 is a `hidden beast` number, since 611 + 2 + 16 + 0 + 25 + 5 + 7 = 666.

It is not a de Polignac number, because 61121602557 - 2¹⁰ = 61121601533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61121602559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1788682 + ... + 1822532.

It is an arithmetic number, because the mean of its divisors is an integer number (3695171480).

Almost surely, 2^61121602557 is an apocalyptic number.

It is an amenable number.

61121602557 is a deficient number, since it is larger than the sum of its proper divisors (27562512963).

61121602557 is a wasteful number, since it uses less digits than its factorization.

61121602557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34753 (or 34750 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 61121602557 in words is "sixty-one billion, one hundred twenty-one million, six hundred two thousand, five hundred fifty-seven".