80721507629 has 8 divisors (see below), whose sum is σ = 92259141120. Its totient is φ = 69185371536.

The previous prime is 80721507617. The next prime is 80721507637. The reversal of 80721507629 is 92670512708.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80721507629 - 2¹⁶ = 80721442093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80721507029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256349 + ... + 476610.

It is an arithmetic number, because the mean of its divisors is an integer number (11532392640).

Almost surely, 2^80721507629 is an apocalyptic number.

It is an amenable number.

80721507629 is a deficient number, since it is larger than the sum of its proper divisors (11537633491).

80721507629 is a wasteful number, since it uses less digits than its factorization.

80721507629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748699.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 80721507629 in words is "eighty billion, seven hundred twenty-one million, five hundred seven thousand, six hundred twenty-nine".