1551276400655 has 8 divisors (see below), whose sum is σ = 1901138738112. Its totient is φ = 1214616415648.

The previous prime is 1551276400651. The next prime is 1551276400699. The reversal of 1551276400655 is 5560046721551.

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 1551276400655 - 2² = 1551276400651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551276400651) 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, 3300587852 + ... + 3300588321.

It is an arithmetic number, because the mean of its divisors is an integer number (237642342264).

Almost surely, 2^{1551276400655} is an apocalyptic number.

1551276400655 is a deficient number, since it is larger than the sum of its proper divisors (349862337457).

1551276400655 is an equidigital number, since it uses as much as digits as its factorization.

1551276400655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6601176225.

The product of its (nonzero) digits is 1260000, while the sum is 47.

The spelling of 1551276400655 in words is "one trillion, five hundred fifty-one billion, two hundred seventy-six million, four hundred thousand, six hundred fifty-five".