51720155003 has 8 divisors (see below), whose sum is σ = 59740927920. Its totient is φ = 44252538880.

The previous prime is 51720154987. The next prime is 51720155017. The reversal of 51720155003 is 30055102715.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51720155003 - 2⁴ = 51720154987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51720155063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138288998 + ... + 138289371.

It is an arithmetic number, because the mean of its divisors is an integer number (7467615990).

Almost surely, 2^51720155003 is an apocalyptic number.

51720155003 is a deficient number, since it is larger than the sum of its proper divisors (8020772917).

51720155003 is a wasteful number, since it uses less digits than its factorization.

51720155003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276578397.

The product of its (nonzero) digits is 5250, while the sum is 29.

Adding to 51720155003 its reverse (30055102715), we get a palindrome (81775257718).

The spelling of 51720155003 in words is "fifty-one billion, seven hundred twenty million, one hundred fifty-five thousand, three".