87321036978437 has 2 divisors, whose sum is σ = 87321036978438. Its totient is φ = 87321036978436.

The previous prime is 87321036978431. The next prime is 87321036978451. The reversal of 87321036978437 is 73487963012378.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85323905564836 + 1997131413601 = 9237094^2 + 1413199^2 .

It is a cyclic number.

It is not a de Polignac number, because 87321036978437 - 2²⁴ = 87321020201221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87321036978431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43660518489218 + 43660518489219.

It is an arithmetic number, because the mean of its divisors is an integer number (43660518489219).

Almost surely, 2^{87321036978437} is an apocalyptic number.

It is an amenable number.

87321036978437 is a deficient number, since it is larger than the sum of its proper divisors (1).

87321036978437 is an equidigital number, since it uses as much as digits as its factorization.

87321036978437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256048128, while the sum is 68.

The spelling of 87321036978437 in words is "eighty-seven trillion, three hundred twenty-one billion, thirty-six million, nine hundred seventy-eight thousand, four hundred thirty-seven".