87978498551 has 2 divisors, whose sum is σ = 87978498552. Its totient is φ = 87978498550.

The previous prime is 87978498533. The next prime is 87978498557. The reversal of 87978498551 is 15589487978.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87978498551 - 2¹⁰ = 87978497527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87978498557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43989249275 + 43989249276.

It is an arithmetic number, because the mean of its divisors is an integer number (43989249276).

Almost surely, 2^87978498551 is an apocalyptic number.

87978498551 is a deficient number, since it is larger than the sum of its proper divisors (1).

87978498551 is an equidigital number, since it uses as much as digits as its factorization.

87978498551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 203212800, while the sum is 71.

The spelling of 87978498551 in words is "eighty-seven billion, nine hundred seventy-eight million, four hundred ninety-eight thousand, five hundred fifty-one".