77281401616 has 10 divisors (see below), whose sum is σ = 149732715662. Its totient is φ = 38640700800.

The previous prime is 77281401611. The next prime is 77281401619. The reversal of 77281401616 is 61610418277.

It can be written as a sum of positive squares in only one way, i.e., 46051443216 + 31229958400 = 214596^2 + 176720^2 .

It is a super-2 number, since 2×77281401616² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77281401611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2415043785 + ... + 2415043816.

Almost surely, 2^77281401616 is an apocalyptic number.

It is an amenable number.

77281401616 is a deficient number, since it is larger than the sum of its proper divisors (72451314046).

77281401616 is a wasteful number, since it uses less digits than its factorization.

77281401616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830087609 (or 4830087603 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 77281401616 in words is "seventy-seven billion, two hundred eighty-one million, four hundred one thousand, six hundred sixteen".