70280661025 has 27 divisors (see below), whose sum is σ = 89629576491. Its totient is φ = 54666771840.

The previous prime is 70280661023. The next prime is 70280661067. The reversal of 70280661025 is 52016608207.

It is a happy number.

The square root of 70280661025 is 265105.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 888457249 + 69392203776 = 29807^2 + 263424^2 .

It is not a de Polignac number, because 70280661025 - 2¹ = 70280661023 is a prime.

It is a super-2 number, since 2×70280661025² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70280661023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 49043709 + ... + 49045141.

Almost surely, 2^70280661025 is an apocalyptic number.

70280661025 is the 265105-th square number.

70280661025 is the 132553-rd centered octagonal number.

It is an amenable number.

70280661025 is a deficient number, since it is larger than the sum of its proper divisors (19348915466).

70280661025 is an frugal number, since it uses more digits than its factorization.

70280661025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 70280661025 in words is "seventy billion, two hundred eighty million, six hundred sixty-one thousand, twenty-five".