51654322251 has 24 divisors (see below), whose sum is σ = 87084900864. Its totient is φ = 28888737840.

The previous prime is 51654322243. The next prime is 51654322259. The reversal of 51654322251 is 15222345615.

It is an interprime number because it is at equal distance from previous prime (51654322243) and next prime (51654322259).

It is not a de Polignac number, because 51654322251 - 2³ = 51654322243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51654322259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8719485 + ... + 8725406.

It is an arithmetic number, because the mean of its divisors is an integer number (3628537536).

Almost surely, 2^51654322251 is an apocalyptic number.

51654322251 is a deficient number, since it is larger than the sum of its proper divisors (35430578613).

51654322251 is a wasteful number, since it uses less digits than its factorization.

51654322251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17444951 (or 17444948 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

Adding to 51654322251 its reverse (15222345615), we get a palindrome (66876667866).

The spelling of 51654322251 in words is "fifty-one billion, six hundred fifty-four million, three hundred twenty-two thousand, two hundred fifty-one".