671051621551 has 4 divisors (see below), whose sum is σ = 674528573152. Its totient is φ = 667574669952.

The previous prime is 671051621503. The next prime is 671051621599. The reversal of 671051621551 is 155126150176.

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

It is an interprime number because it is at equal distance from previous prime (671051621503) and next prime (671051621599).

It is a cyclic number.

It is not a de Polignac number, because 671051621551 - 2¹³ = 671051613359 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 (671051621501) 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, 1738475511 + ... + 1738475896.

It is an arithmetic number, because the mean of its divisors is an integer number (168632143288).

Almost surely, 2^671051621551 is an apocalyptic number.

671051621551 is a deficient number, since it is larger than the sum of its proper divisors (3476951601).

671051621551 is a wasteful number, since it uses less digits than its factorization.

671051621551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476951600.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 671051621551 in words is "six hundred seventy-one billion, fifty-one million, six hundred twenty-one thousand, five hundred fifty-one".