51261411061542 has 48 divisors (see below), whose sum is σ = 112812999022080. Its totient is φ = 15516857830320.

The previous prime is 51261411061513. The next prime is 51261411061543. The reversal of 51261411061542 is 24516011416215.

It is a happy number.

It is a super-2 number, since 2×51261411061542² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51261411061542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51261411061543) 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, 37748478 + ... + 39082865.

It is an arithmetic number, because the mean of its divisors is an integer number (2350270812960).

Almost surely, 2^{51261411061542} is an apocalyptic number.

51261411061542 is an abundant number, since it is smaller than the sum of its proper divisors (61551587960538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51261411061542 is a wasteful number, since it uses less digits than its factorization.

51261411061542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76832289 (or 76832278 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

Adding to 51261411061542 its reverse (24516011416215), we get a palindrome (75777422477757).

The spelling of 51261411061542 in words is "fifty-one trillion, two hundred sixty-one billion, four hundred eleven million, sixty-one thousand, five hundred forty-two".