61555203351 has 48 divisors (see below), whose sum is σ = 97154703360. Its totient is φ = 37451695680.

The previous prime is 61555203341. The next prime is 61555203373. The reversal of 61555203351 is 15330255516.

61555203351 is a `hidden beast` number, since 6 + 1 + 55 + 520 + 33 + 51 = 666.

It is not a de Polignac number, because 61555203351 - 2¹⁹ = 61554679063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555203341) 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, 259450 + ... + 436376.

It is an arithmetic number, because the mean of its divisors is an integer number (2024056320).

Almost surely, 2^61555203351 is an apocalyptic number.

61555203351 is a deficient number, since it is larger than the sum of its proper divisors (35599500009).

61555203351 is a wasteful number, since it uses less digits than its factorization.

61555203351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177036 (or 177033 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

Adding to 61555203351 its reverse (15330255516), we get a palindrome (76885458867).

The spelling of 61555203351 in words is "sixty-one billion, five hundred fifty-five million, two hundred three thousand, three hundred fifty-one".