51061001555 has 8 divisors (see below), whose sum is σ = 61274476944. Its totient is φ = 40847951200.

The previous prime is 51061001533. The next prime is 51061001557. The reversal of 51061001555 is 55510016015.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51061001555 - 2¹⁶ = 51060936019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51061001557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297560 + ... + 436650.

It is an arithmetic number, because the mean of its divisors is an integer number (7659309618).

Almost surely, 2^51061001555 is an apocalyptic number.

51061001555 is a deficient number, since it is larger than the sum of its proper divisors (10213475389).

51061001555 is a wasteful number, since it uses less digits than its factorization.

51061001555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212517.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 51061001555 in words is "fifty-one billion, sixty-one million, one thousand, five hundred fifty-five".