15551206631401 has 4 divisors (see below), whose sum is σ = 17772807578752. Its totient is φ = 13329605684052.

The previous prime is 15551206631383. The next prime is 15551206631413. The reversal of 15551206631401 is 10413660215551.

15551206631401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-15551206631401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551206631201) 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, 1110800473665 + ... + 1110800473678.

It is an arithmetic number, because the mean of its divisors is an integer number (4443201894688).

Almost surely, 2^{15551206631401} is an apocalyptic number.

It is an amenable number.

15551206631401 is a deficient number, since it is larger than the sum of its proper divisors (2221600947351).

15551206631401 is an equidigital number, since it uses as much as digits as its factorization.

15551206631401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221600947350.

The product of its (nonzero) digits is 108000, while the sum is 40.

Adding to 15551206631401 its reverse (10413660215551), we get a palindrome (25964866846952).

The spelling of 15551206631401 in words is "fifteen trillion, five hundred fifty-one billion, two hundred six million, six hundred thirty-one thousand, four hundred one".