1971677472551 has 4 divisors (see below), whose sum is σ = 1971884308632. Its totient is φ = 1971470636472.

The previous prime is 1971677472539. The next prime is 1971677472559. The reversal of 1971677472551 is 1552747761791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1971677472551 - 2¹⁰ = 1971677471527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971677472559) 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 3 ways as a sum of consecutive naturals, for example, 103403741 + ... + 103422806.

It is an arithmetic number, because the mean of its divisors is an integer number (492971077158).

Almost surely, 2^{1971677472551} is an apocalyptic number.

1971677472551 is a deficient number, since it is larger than the sum of its proper divisors (206836081).

1971677472551 is an equidigital number, since it uses as much as digits as its factorization.

1971677472551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206836080.

The product of its digits is 25930800, while the sum is 62.

The spelling of 1971677472551 in words is "one trillion, nine hundred seventy-one billion, six hundred seventy-seven million, four hundred seventy-two thousand, five hundred fifty-one".