73978451551 has 2 divisors, whose sum is σ = 73978451552. Its totient is φ = 73978451550.

The previous prime is 73978451543. The next prime is 73978451567. The reversal of 73978451551 is 15515487937.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73978451551 - 2³ = 73978451543 is a prime.

It is a super-2 number, since 2×73978451551² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 73978451492 and 73978451501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73978401551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36989225775 + 36989225776.

It is an arithmetic number, because the mean of its divisors is an integer number (36989225776).

Almost surely, 2^73978451551 is an apocalyptic number.

73978451551 is a deficient number, since it is larger than the sum of its proper divisors (1).

73978451551 is an equidigital number, since it uses as much as digits as its factorization.

73978451551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292000, while the sum is 55.

The spelling of 73978451551 in words is "seventy-three billion, nine hundred seventy-eight million, four hundred fifty-one thousand, five hundred fifty-one".