78881463636242 has 4 divisors (see below), whose sum is σ = 118322195454366. Its totient is φ = 39440731818120.

The previous prime is 78881463636211. The next prime is 78881463636253. The reversal of 78881463636242 is 24263636418887.

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

It can be written as a sum of positive squares in only one way, i.e., 64805542935721 + 14075920700521 = 8050189^2 + 3751789^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19720365909059 + ... + 19720365909062.

Almost surely, 2^{78881463636242} is an apocalyptic number.

78881463636242 is a deficient number, since it is larger than the sum of its proper divisors (39440731818124).

78881463636242 is a wasteful number, since it uses less digits than its factorization.

78881463636242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39440731818123.

The product of its digits is 445906944, while the sum is 68.

The spelling of 78881463636242 in words is "seventy-eight trillion, eight hundred eighty-one billion, four hundred sixty-three million, six hundred thirty-six thousand, two hundred forty-two".