61556215575 has 48 divisors (see below), whose sum is σ = 102455362080. Its totient is φ = 32610209280.

The previous prime is 61556215573. The next prime is 61556215579. The reversal of 61556215575 is 57551265516.

61556215575 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61556215575 - 2¹ = 61556215573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61556215573) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26844129 + ... + 26846421.

It is an arithmetic number, because the mean of its divisors is an integer number (2134486710).

Almost surely, 2^61556215575 is an apocalyptic number.

61556215575 is a deficient number, since it is larger than the sum of its proper divisors (40899146505).

61556215575 is a wasteful number, since it uses less digits than its factorization.

61556215575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548 (or 4543 counting only the distinct ones).

The product of its digits is 1575000, while the sum is 48.

The spelling of 61556215575 in words is "sixty-one billion, five hundred fifty-six million, two hundred fifteen thousand, five hundred seventy-five".