51662477243 has 4 divisors (see below), whose sum is σ = 55636513968. Its totient is φ = 47688440520.

The previous prime is 51662477239. The next prime is 51662477287. The reversal of 51662477243 is 34277426615.

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 51662477243 - 2² = 51662477239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51662479243) 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, 1987018343 + ... + 1987018368.

It is an arithmetic number, because the mean of its divisors is an integer number (13909128492).

Almost surely, 2^51662477243 is an apocalyptic number.

51662477243 is a deficient number, since it is larger than the sum of its proper divisors (3974036725).

51662477243 is a wasteful number, since it uses less digits than its factorization.

51662477243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974036724.

The product of its digits is 1693440, while the sum is 47.

The spelling of 51662477243 in words is "fifty-one billion, six hundred sixty-two million, four hundred seventy-seven thousand, two hundred forty-three".