1555120051001 has 8 divisors (see below), whose sum is σ = 1696513097664. Its totient is φ = 1413730087120.

The previous prime is 1555120050959. The next prime is 1555120051019. The reversal of 1555120051001 is 1001500215551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555120051001 is a prime.

It is a super-2 number, since 2×1555120051001² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1555120051091) 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, 355655 + ... + 1799091.

It is an arithmetic number, because the mean of its divisors is an integer number (212064137208).

Almost surely, 2^{1555120051001} is an apocalyptic number.

1555120051001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1555120051001 is a deficient number, since it is larger than the sum of its proper divisors (141393046663).

1555120051001 is a wasteful number, since it uses less digits than its factorization.

1555120051001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541391.

The product of its (nonzero) digits is 1250, while the sum is 26.

Adding to 1555120051001 its reverse (1001500215551), we get a palindrome (2556620266552).

The spelling of 1555120051001 in words is "one trillion, five hundred fifty-five billion, one hundred twenty million, fifty-one thousand, one".