67780623891 has 16 divisors (see below), whose sum is σ = 95719536000. Its totient is φ = 42516021888.

The previous prime is 67780623877. The next prime is 67780623913. The reversal of 67780623891 is 19832608776.

It is not a de Polignac number, because 67780623891 - 2²³ = 67772235283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67780623871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33181 + ... + 369678.

It is an arithmetic number, because the mean of its divisors is an integer number (5982471000).

Almost surely, 2^67780623891 is an apocalyptic number.

67780623891 is a deficient number, since it is larger than the sum of its proper divisors (27938912109).

67780623891 is a wasteful number, since it uses less digits than its factorization.

67780623891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406178.

The product of its (nonzero) digits is 6096384, while the sum is 57.

The spelling of 67780623891 in words is "sixty-seven billion, seven hundred eighty million, six hundred twenty-three thousand, eight hundred ninety-one".