1551721515116 has 12 divisors (see below), whose sum is σ = 2715531939120. Its totient is φ = 775855246800.

The previous prime is 1551721515107. The next prime is 1551721515119. The reversal of 1551721515116 is 6115151271551.

It is not an unprimeable number, because it can be changed into a prime (1551721515119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707960 + ... + 1898591.

It is an arithmetic number, because the mean of its divisors is an integer number (226294328260).

Almost surely, 2^{1551721515116} is an apocalyptic number.

It is an amenable number.

1551721515116 is a deficient number, since it is larger than the sum of its proper divisors (1163810424004).

1551721515116 is a wasteful number, since it uses less digits than its factorization.

1551721515116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755384 (or 2755382 counting only the distinct ones).

The product of its digits is 52500, while the sum is 41.

Adding to 1551721515116 its reverse (6115151271551), we get a palindrome (7666872786667).

The spelling of 1551721515116 in words is "one trillion, five hundred fifty-one billion, seven hundred twenty-one million, five hundred fifteen thousand, one hundred sixteen".