66503016451 has 8 divisors (see below), whose sum is σ = 68455993760. Its totient is φ = 64558228608.

The previous prime is 66503016449. The next prime is 66503016467. The reversal of 66503016451 is 15461030566.

66503016451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 66503016451 - 2¹ = 66503016449 is a prime.

It is a super-4 number, since 4×66503016451⁴ (a number of 44 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66503016451.

It is not an unprimeable number, because it can be changed into a prime (66503011451) 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, 2030886 + ... + 2063371.

It is an arithmetic number, because the mean of its divisors is an integer number (8556999220).

Almost surely, 2^66503016451 is an apocalyptic number.

66503016451 is a deficient number, since it is larger than the sum of its proper divisors (1952977309).

66503016451 is a wasteful number, since it uses less digits than its factorization.

66503016451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094733.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 66503016451 in words is "sixty-six billion, five hundred three million, sixteen thousand, four hundred fifty-one".