51534071645 has 16 divisors (see below), whose sum is σ = 71670728448. Its totient is φ = 34839934080.

The previous prime is 51534071629. The next prime is 51534071671. The reversal of 51534071645 is 54617043515.

It is a happy number.

It is not a de Polignac number, because 51534071645 - 2⁴ = 51534071629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10366544 + ... + 10371513.

It is an arithmetic number, because the mean of its divisors is an integer number (4479420528).

Almost surely, 2^51534071645 is an apocalyptic number.

It is an amenable number.

51534071645 is a deficient number, since it is larger than the sum of its proper divisors (20136656803).

51534071645 is a wasteful number, since it uses less digits than its factorization.

51534071645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20738140.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 51534071645 in words is "fifty-one billion, five hundred thirty-four million, seventy-one thousand, six hundred forty-five".