87156786049 has 4 divisors (see below), whose sum is σ = 87471431764. Its totient is φ = 86842140336.

The previous prime is 87156785993. The next prime is 87156786061. The reversal of 87156786049 is 94068765178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24263669824 + 62893116225 = 155768^2 + 250785^2 .

It is a cyclic number.

It is not a de Polignac number, because 87156786049 - 2²¹ = 87154688897 is a prime.

It is a super-2 number, since 2×87156786049² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87156786089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157322442 + ... + 157322995.

It is an arithmetic number, because the mean of its divisors is an integer number (21867857941).

Almost surely, 2^87156786049 is an apocalyptic number.

It is an amenable number.

87156786049 is a deficient number, since it is larger than the sum of its proper divisors (314645715).

87156786049 is a wasteful number, since it uses less digits than its factorization.

87156786049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314645714.

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 87156786049 in words is "eighty-seven billion, one hundred fifty-six million, seven hundred eighty-six thousand, forty-nine".