1556998996551 has 8 divisors (see below), whose sum is σ = 2076622285680. Its totient is φ = 1037687519232.

The previous prime is 1556998996507. The next prime is 1556998996601.

1556998996551 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1556998996551 - 2²⁹ = 1556462125639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556998998551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77941300 + ... + 77961273.

It is an arithmetic number, because the mean of its divisors is an integer number (259577785710).

Almost surely, 2^{1556998996551} is an apocalyptic number.

1556998996551 is a deficient number, since it is larger than the sum of its proper divisors (519623289129).

1556998996551 is a wasteful number, since it uses less digits than its factorization.

1556998996551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155905905.

The product of its digits is 1180980000, while the sum is 78.

The spelling of 1556998996551 in words is "one trillion, five hundred fifty-six billion, nine hundred ninety-eight million, nine hundred ninety-six thousand, five hundred fifty-one".