51111403561551 has 8 divisors (see below), whose sum is σ = 68290810606080. Its totient is φ = 34003132779032.

The previous prime is 51111403561549. The next prime is 51111403561567. The reversal of 51111403561551 is 15516530411115.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51111403561551 - 2¹ = 51111403561549 is a prime.

It is a super-2 number, since 2×51111403561551² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111403561571) 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, 17784063825 + ... + 17784066698.

It is an arithmetic number, because the mean of its divisors is an integer number (8536351325760).

Almost surely, 2^{51111403561551} is an apocalyptic number.

51111403561551 is a deficient number, since it is larger than the sum of its proper divisors (17179407044529).

51111403561551 is a wasteful number, since it uses less digits than its factorization.

51111403561551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35568131005.

The product of its (nonzero) digits is 45000, while the sum is 39.

Adding to 51111403561551 its reverse (15516530411115), we get a palindrome (66627933972666).

The spelling of 51111403561551 in words is "fifty-one trillion, one hundred eleven billion, four hundred three million, five hundred sixty-one thousand, five hundred fifty-one".